/*
* msgq --
* Display a message.
*
* PUBLIC: void msgq(SCR *, mtype_t, const char *, ...);
*/
void
msgq(
SCR *sp,
mtype_t mt,
const char *fmt,
...)
{
#ifndef NL_ARGMAX
#define __NL_ARGMAX 20 /* Set to 9 by System V. */
struct {
const char *str; /* String pointer. */
size_t arg; /* Argument number. */
size_t prefix; /* Prefix string length. */
size_t skip; /* Skipped string length. */
size_t suffix; /* Suffix string length. */
} str[__NL_ARGMAX];
#endif
static int reenter; /* STATIC: Re-entrancy check. */
GS *gp;
size_t blen, len, mlen, nlen;
const char *p;
char *bp, *mp;
va_list ap;
#ifndef NL_ARGMAX
int ch;
char *rbp, *s_rbp;
const char *t, *u;
size_t cnt1, cnt2, soff;
#endif
/*
* !!!
* It's possible to enter msg when there's no screen to hold the
* message. If sp is NULL, ignore the special cases and put the
* message out to stderr.
*/
if (sp == NULL) {
gp = NULL;
if (mt == M_BERR)
mt = M_ERR;
else if (mt == M_VINFO)
mt = M_INFO;
} else {
gp = sp->gp;
switch (mt) {
case M_BERR:
if (F_ISSET(sp, SC_VI) && !O_ISSET(sp, O_VERBOSE)) {
F_SET(gp, G_BELLSCHED);
return;
}
mt = M_ERR;
break;
case M_VINFO:
if (!O_ISSET(sp, O_VERBOSE))
return;
mt = M_INFO;
/* FALLTHROUGH */
case M_INFO:
if (F_ISSET(sp, SC_EX_SILENT))
return;
break;
case M_ERR:
case M_SYSERR:
break;
default:
abort();
}
}
/*
* It's possible to reenter msg when it allocates space. We're
* probably dead anyway, but there's no reason to drop core.
*
* XXX
* Yes, there's a race, but it should only be two instructions.
*/
if (reenter++)
return;
/* Get space for the message. */
nlen = 1024;
if (0) {
retry: FREE_SPACE(sp, bp, blen);
nlen *= 2;
}
bp = NULL;
blen = 0;
GET_SPACE_GOTOC(sp, bp, blen, nlen);
/*
* Error prefix.
*
* mp: pointer to the current next character to be written
* mlen: length of the already written characters
* blen: total length of the buffer
*/
#define REM (blen - mlen)
mp = bp;
mlen = 0;
if (mt == M_SYSERR) {
p = msg_cat(sp, "020|Error: ", &len);
if (REM < len)
goto retry;
memcpy(mp, p, len);
mp += len;
mlen += len;
}
/*
* If we're running an ex command that the user didn't enter, display
* the file name and line number prefix.
*/
if ((mt == M_ERR || mt == M_SYSERR) &&
sp != NULL && gp != NULL && gp->if_name != NULL) {
CHAR_T *wp;
size_t wlen;
CHAR2INT(sp, gp->if_name, strlen(gp->if_name) + 1, wp, wlen);
for (; *wp != '\0'; ++wp) {
len = snprintf(mp, REM, "%s", KEY_NAME(sp, *wp));
mp += len;
if ((mlen += len) > blen)
goto retry;
}
len = snprintf(mp, REM, ", %d: ", gp->if_lno);
mp += len;
if ((mlen += len) > blen)
goto retry;
}
/* If nothing to format, we're done. */
if (fmt == NULL)
goto nofmt;
fmt = msg_cat(sp, fmt, NULL);
#ifndef NL_ARGMAX
/*
* Nvi should run on machines that don't support the numbered argument
* specifications (%[digit]*$). We do this by reformatting the string
* so that we can hand it to vsprintf(3) and it will use the arguments
* in the right order. When vsprintf returns, we put the string back
* into the right order. It's undefined, according to SVID III, to mix
* numbered argument specifications with the standard style arguments,
* so this should be safe.
*
* In addition, we also need a character that is known to not occur in
* any vi message, for separating the parts of the string. As callers
* of msgq are responsible for making sure that all the non-printable
* characters are formatted for printing before calling msgq, we use a
* random non-printable character selected at terminal initialization
* time. This code isn't fast by any means, but as messages should be
* relatively short and normally have only a few arguments, it won't be
* too bad. Regardless, nobody has come up with any other solution.
*
* The result of this loop is an array of pointers into the message
* string, with associated lengths and argument numbers. The array
* is in the "correct" order, and the arg field contains the argument
* order.
*/
for (p = fmt, soff = 0; soff < __NL_ARGMAX;) {
for (t = p; *p != '\0' && *p != '%'; ++p);
if (*p == '\0')
break;
++p;
if (!isdigit(*p)) {
if (*p == '%')
++p;
continue;
}
for (u = p; *++p != '\0' && isdigit(*p););
if (*p != '$')
continue;
/* Up to, and including the % character. */
str[soff].str = t;
str[soff].prefix = u - t;
/* Up to, and including the $ character. */
str[soff].arg = atoi(u);
str[soff].skip = (p - u) + 1;
if (str[soff].arg >= __NL_ARGMAX)
goto ret;
/* Up to, and including the conversion character. */
for (u = p; (ch = *++p) != '\0';)
if (isalpha(ch) &&
strchr("diouxXfeEgGcspn", ch) != NULL)
break;
str[soff].suffix = p - u;
if (ch != '\0')
++p;
++soff;
}
/* If no magic strings, we're done. */
if (soff == 0)
goto format;
/* Get space for the reordered strings. */
if ((rbp = malloc(nlen)) == NULL)
goto ret;
s_rbp = rbp;
/*
* Reorder the strings into the message string based on argument
* order.
*
* !!!
* We ignore arguments that are out of order, i.e. if we don't find
* an argument, we continue. Assume (almost certainly incorrectly)
* that whoever created the string knew what they were doing.
*
* !!!
* Brute force "sort", but since we don't expect more than one or two
* arguments in a string, the setup cost of a fast sort will be more
* expensive than the loop.
*/
for (cnt1 = 1; cnt1 <= soff; ++cnt1)
for (cnt2 = 0; cnt2 < soff; ++cnt2)
if (cnt1 == str[cnt2].arg) {
memmove(s_rbp, str[cnt2].str, str[cnt2].prefix);
memmove(s_rbp + str[cnt2].prefix,
str[cnt2].str + str[cnt2].prefix +
str[cnt2].skip, str[cnt2].suffix);
s_rbp += str[cnt2].prefix + str[cnt2].suffix;
*s_rbp++ =
gp == NULL ? DEFAULT_NOPRINT : gp->noprint;
break;
}
*s_rbp = '\0';
fmt = rbp;
#endif
#ifndef NL_ARGMAX
format: /* Format the arguments into the string. */
#endif
va_start(ap, fmt);
len = vsnprintf(mp, REM, fmt, ap);
va_end(ap);
if (len >= nlen)
goto retry;
#ifndef NL_ARGMAX
if (soff == 0)
goto nofmt;
/*
* Go through the resulting string, and, for each separator character
* separated string, enter its new starting position and length in the
* array.
*/
for (p = t = mp, cnt1 = 1,
ch = gp == NULL ? DEFAULT_NOPRINT : gp->noprint; *p != '\0'; ++p)
if (*p == ch) {
for (cnt2 = 0; cnt2 < soff; ++cnt2)
if (str[cnt2].arg == cnt1)
break;
str[cnt2].str = t;
str[cnt2].prefix = p - t;
t = p + 1;
++cnt1;
}
/*
* Reorder the strings once again, putting them back into the
* message buffer.
*
* !!!
* Note, the length of the message gets decremented once for
* each substring, when we discard the separator character.
*/
for (s_rbp = rbp, cnt1 = 0; cnt1 < soff; ++cnt1) {
memmove(rbp, str[cnt1].str, str[cnt1].prefix);
rbp += str[cnt1].prefix;
--len;
}
memmove(mp, s_rbp, rbp - s_rbp);
/* Free the reordered string memory. */
free(s_rbp);
#endif
nofmt: mp += len;
if ((mlen += len) > blen)
goto retry;
if (mt == M_SYSERR) {
len = snprintf(mp, REM, ": %s", strerror(errno));
mp += len;
if ((mlen += len) > blen)
goto retry;
mt = M_ERR;
}
/* Add trailing newline. */
if ((mlen += 1) > blen)
goto retry;
*mp = '\n';
if (sp != NULL)
(void)ex_fflush(sp);
if (gp != NULL)
gp->scr_msg(sp, mt, bp, mlen);
else
(void)fprintf(stderr, "%.*s", (int)mlen, bp);
/* Cleanup. */
#ifndef NL_ARGMAX
ret:
#endif
FREE_SPACE(sp, bp, blen);
alloc_err:
reenter = 0;
}
/*
* vs_resolve --
* Deal with message output.
*
* PUBLIC: int vs_resolve(SCR *, SCR *, int);
*/
int
vs_resolve(SCR *sp, SCR *csp, int forcewait)
{
EVENT ev;
GS *gp;
MSGS *mp;
VI_PRIVATE *vip;
size_t oldy, oldx;
int redraw;
/*
* Vs_resolve is called from the main vi loop and the refresh function
* to periodically ensure that the user has seen any messages that have
* been displayed and that any status lines are correct. The sp screen
* is the screen we're checking, usually the current screen. When it's
* not, csp is the current screen, used for final cursor positioning.
*/
gp = sp->gp;
vip = VIP(sp);
if (csp == NULL)
csp = sp;
/* Save the cursor position. */
(void)gp->scr_cursor(csp, &oldy, &oldx);
/* Ring the bell if it's scheduled. */
if (F_ISSET(gp, G_BELLSCHED)) {
F_CLR(gp, G_BELLSCHED);
(void)gp->scr_bell(sp);
}
/* Display new file status line. */
if (F_ISSET(sp, SC_STATUS)) {
F_CLR(sp, SC_STATUS);
msgq_status(sp, sp->lno, MSTAT_TRUNCATE);
}
/* Report on line modifications. */
mod_rpt(sp);
/*
* Flush any saved messages. If the screen isn't ready, refresh
* it. (A side-effect of screen refresh is that we can display
* messages.) Once this is done, don't trust the cursor. That
* extra refresh screwed the pooch.
*/
if (LIST_FIRST(&gp->msgq) != NULL) {
if (!F_ISSET(sp, SC_SCR_VI) && vs_refresh(sp, 1))
return (1);
while ((mp = LIST_FIRST(&gp->msgq)) != NULL) {
gp->scr_msg(sp, mp->mtype, mp->buf, mp->len);
LIST_REMOVE(mp, q);
free(mp->buf);
free(mp);
}
F_SET(vip, VIP_CUR_INVALID);
}
switch (vip->totalcount) {
case 0:
redraw = 0;
break;
case 1:
/*
* If we're switching screens, we have to wait for messages,
* regardless. If we don't wait, skip updating the modeline.
*/
if (forcewait)
vs_scroll(sp, NULL, SCROLL_W);
else
F_SET(vip, VIP_S_MODELINE);
redraw = 0;
break;
default:
/*
* If >1 message line in use, prompt the user to continue and
* repaint overwritten lines.
*/
vs_scroll(sp, NULL, SCROLL_W);
ev.e_event = E_REPAINT;
ev.e_flno = vip->totalcount >=
sp->rows ? 1 : sp->rows - vip->totalcount;
ev.e_tlno = sp->rows;
redraw = 1;
break;
}
/* Reset the count of overwriting lines. */
vip->linecount = vip->lcontinue = vip->totalcount = 0;
/* Redraw. */
if (redraw)
(void)vs_repaint(sp, &ev);
/* Restore the cursor position. */
(void)gp->scr_move(csp, oldy, oldx);
return (0);
}
